13af6ab5fSopenharmony_ci# ``Symbol()`` API is not supported 23af6ab5fSopenharmony_ci 33af6ab5fSopenharmony_ciRule ``arkts-no-symbol`` 43af6ab5fSopenharmony_ci 53af6ab5fSopenharmony_ci**Severity: error** 63af6ab5fSopenharmony_ci 73af6ab5fSopenharmony_ciTypeScript has ``Symbol()`` API, which can be used among other things to generate 83af6ab5fSopenharmony_ciunique property names at runtime. ArkTS does not support ``Symbol()`` API 93af6ab5fSopenharmony_cibecause its most popular use cases make no sense in the statically typed 103af6ab5fSopenharmony_cienvironment. In particular, the object layout is defined at compile time, 113af6ab5fSopenharmony_ciand cannot be changed at runtime. 123af6ab5fSopenharmony_ci 133af6ab5fSopenharmony_ci``Symbol.iterator`` and iterable interfaces are supported in ArkTS. 143af6ab5fSopenharmony_ci 153af6ab5fSopenharmony_ci 163af6ab5fSopenharmony_ci## TypeScript 173af6ab5fSopenharmony_ci 183af6ab5fSopenharmony_ci 193af6ab5fSopenharmony_ci``` 203af6ab5fSopenharmony_ci 213af6ab5fSopenharmony_ci const sym = Symbol() 223af6ab5fSopenharmony_ci let o = { 233af6ab5fSopenharmony_ci [sym]: "value" 243af6ab5fSopenharmony_ci } 253af6ab5fSopenharmony_ci 263af6ab5fSopenharmony_ci``` 273af6ab5fSopenharmony_ci 283af6ab5fSopenharmony_ci## ArkTS 293af6ab5fSopenharmony_ci 303af6ab5fSopenharmony_ci 313af6ab5fSopenharmony_ci``` 323af6ab5fSopenharmony_ci 333af6ab5fSopenharmony_ci class SomeClass { 343af6ab5fSopenharmony_ci public someProperty : string = "" 353af6ab5fSopenharmony_ci } 363af6ab5fSopenharmony_ci let o = new SomeClass() 373af6ab5fSopenharmony_ci 383af6ab5fSopenharmony_ci``` 393af6ab5fSopenharmony_ci 403af6ab5fSopenharmony_ci## See also 413af6ab5fSopenharmony_ci 423af6ab5fSopenharmony_ci- Recipe 001: Objects with property names that are not identifiers are not supported (``arkts-identifiers-as-prop-names``) 433af6ab5fSopenharmony_ci- Recipe 029: Indexed access is not supported for fields (``arkts-no-props-by-index``) 443af6ab5fSopenharmony_ci- Recipe 059: ``delete`` operator is not supported (``arkts-no-delete``) 453af6ab5fSopenharmony_ci- Recipe 060: ``typeof`` operator is allowed only in expression contexts (``arkts-no-type-query``) 463af6ab5fSopenharmony_ci- Recipe 066: ``in`` operator is not supported (``arkts-no-in``) 473af6ab5fSopenharmony_ci- Recipe 144: Usage of standard library is restricted (``arkts-limited-stdlib``) 483af6ab5fSopenharmony_ci 493af6ab5fSopenharmony_ci 50